blockchain -- encryption and decryption

数字签名算法(digital signature algorithm)

ECDSA (elliptic curve digital signature algorithm) secp256k1(the parameters of ecdsa used in bitcoin)

1. private key: 32 bytes(256 bit)
2. compressed or uncompressed public key: 33 bytes / 65 bytes
3. signature or compact_signature: 72 bytes/ 65 bytes

derive key algorithm

1. scrypt
2. pbkdf2

proof of stake

1. the node(producing block) selection: two most commonly used methods: 'Randomised Block Selection' and 'Coin Age Selection'

dpow

also see post in bitcoin

DSA && ECDSA

both based on no generally efficient solution to solve a discrete logarithm problem - DSA: discrete logarithm problem with modular exponentiation - ecdsa: discrete logarithm problem wiht elliptic curves

ECDSA && EdDSA

1. using different family of elliptic curve
2. EdDSA While offering slight advantages in speed over ECDSA, its popularity comes from an improvement in security. Instead of relying on a random number for the nonce value, EdDSA generates a nonce deterministically as a hash making it collision resistant